sandsifter
capstone
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| sandsifter | capstone | |
|---|---|---|
| 15 | 1 | |
| 4,826 | 5,294 | |
| - | - | |
| 0.0 | 5.3 | |
| 2 months ago | over 2 years ago | |
| Python | C | |
| BSD 3-clause "New" or "Revised" License | GNU General Public License v3.0 or later |
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sandsifter
- Cascade: CPU Fuzzing via Intricate Program Generation
- Sandsifter: The x86 Processor Fuzzer
- How would undocummented, private ISA extensions work in Linux-based systems?
- I found a bug in Intel Skylake processors
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Is there any opensource switch brand?
This has some background.
- Clever Hack Finds Mystery CPU Instructions
- Sandsifter – The x86 Processor Fuzzer
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The Cursed Computer Iceberg Meme
sandsifter
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Speculating the Entire x86-64 Instruction Set in Seconds with One Weird Trick
This is a really clever technique! I was impressed by sandsifter[1] when it originally came out, and this seems an awful lot faster and less prone to false negatives (since it's purely speculative and doesn't require sandsifter's `#PF` hack).
At the risk of unwarranted self-promotion: the other side of this equation is fidelity in software instruction set decoders. x86's massive size and layers of historical complexity make it among the most difficult instruction formats to accurately decode; I've spent a good part of the last two years working on a fuzzer that's discovered thousands of bugs in various popular x86 decoders[2][3].
[1]: https://github.com/xoreaxeaxeax/sandsifter
[2]: https://github.com/trailofbits/mishegos
[3]: https://ww.easychair.org/publications/preprint_download/1LHr
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Capstone Disassembler Framework
Idea:
If any assembler/disassembler author/team out there wants to produce an assembler/disassembler which is authoritative (difficult to do on x86, because there are so many different possible combinations of instruction encoding, https://github.com/xoreaxeaxeax/sandsifter : "Typically, several million undocumented instructions on your processor will be found, but these generally fall into a small number of different groups.") -- then what they'd do is to create a third program -- which "pits" the output of Assembler A vs. Assembler B, Disassembler A vs. Disassembler B...
That is, between any two assemblers (for the same CPU architecture/instruction set), or any two disassemblers, where are the anomalies?
If we think about an assembler as a simple function, y=f(x), that is, I give it a string of ascii bytes as input (x), and I get a string (1..n) binary bytes as output (y),
capstone
What are some alternatives?
trapcc - Computing with traps
Unicorn Engine - Unicorn CPU emulator framework (ARM, AArch64, M68K, Mips, Sparc, PowerPC, RiscV, S390x, TriCore, X86)
tatradas - Disassembler for x86 executables (16-bit and 32-bit) which supports PE, NE, MZ, COM and ELF file formats
radare2 - UNIX-like reverse engineering framework and command-line toolset
fuzzing - Tutorials, examples, discussions, research proposals, and other resources related to fuzzing
zydis - Fast and lightweight x86/x86-64 disassembler and code generation library
lazarus - Free Pascal Lazarus Project - Sync'ed with Lazarus SubVersion trunk every 15 minutes
ret-sync - ret-sync is a set of plugins that helps to synchronize a debugging session (WinDbg/GDB/LLDB/OllyDbg2/x64dbg) with IDA/Ghidra/Binary Ninja disassemblers.
docs - Hardware and software docs / wiki
android-inline-hook - :fire: ShadowHook is an Android inline hook library which supports thumb, arm32 and arm64.
wcc - The Witchcraft Compiler Collection
cv32e40p - CV32E40P is an in-order 4-stage RISC-V RV32IMFCXpulp CPU based on RI5CY from PULP-Platform